Any website whose sole purpose is to relieve its visitors of money, promising unfeasably poor services in return, although of course, you don't realise this until you've signed over your grandmother. Examples of parasites include E-Cards sites, Mobile Phone ringtone download sites (Jam**er), the various Outlook smiley plugin sites, microsoft.com.

I downloaded the new Crazy Frog ringtone from some parasite, and now Im having my home reposessed.